Removable-body truck



w. M. BAXTER REMOVABLE BODY TRUCK .Filed Aug.14. 1922 4 Sheets-Sheet 1 OMM IAVE/V705:

April 24, 1928.

w. M. BAXTER REMOVABLE BODY TRUCK Filed Aug.14. 1922 4 Sheets-Sheet 2 fry April 24,1928. 1,667,023

W. M. BAXTER REMOVABLE BODY TRUCK Filed Aug-14. 1922 4 Sheets-Sheet 5 April 24, 192s.

w. M. BAXTER REMOVABLE BODY TRUCK Fied Aug.14. 1922 4 Sheets-Sheet 4 v W l VENTO/Z Patented Apr. 2d, 1.9?8;i

UNITED `STATES- 1,667,023 PATENT l OFFICE.

\VILLIAM M. BAXTER, OF CHICAGO, ILLINOIS, ASSIGNOB T IDEAL REMOVABLE BODY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

REMOVABLE-BODY TRUCK.

Application led August .14, 1922. Serial No. 581,565.

This invention pertains in general to trucks and similar vehicles and has reference more particularly to trucks ofthe removable body type. The employment of trucks equipped with removable and interchangeable bodies which can be loaded or unloaded in a warehouse While the truck chassis is transporting a previously loaded body, effects a considerable saving in truck time with a consequent- -reduction in transportation costs, for the reason that the chassis may be kept busy and the loading and unloading of the bodies may be done when convenient. Furthermore, the bodies may be wheeled about the warehouse and loadedK or unloaded directly from or onto the pile of material in the warehouse, Y

thus eliminating the hand truckingand consequent `handling 'and goods. Y

While I am aware that trucks of this general type have heretofore 4been employed,

such for instance as disclosed in U. S. Patent No. 1,293,664, granted February 11, 1919, my present inventionaims to improve the construction and operation of the apparatus by adding certain features and improving other structural details, as will be later explained.

Oneof the features `of my invention resides inthe mountingof the rollers. upon which the truck body is rolled from and onto the truck chassis, the rollers being so mounted that they are yieldable laterally relatively to the body to facilitate the body movements without undue cramping and binding between the rollers and the track l rails.

Another feat-ure ofl my invention is the addition to the body of supporting caster rollers upon which the body may be easily moved about the loading platform or ware.-

house in any direction, these rollers being adjustable from operative toinoperative position at will by the manipulation of a sin le controlling means.

nother purpose of my invention is to facilitate the movement of the bod)r onto and o' from the. chassis which result is accomplished by laterally flaring the ends of thel track rails and also theI forward end -of the rack by which the body is moved through the, instrumentality of a pinion meshing therewith, this flaring servlng te.

rehandling of theA 'it-to be rolled onto a platform which may be higher than the track rails of the chassis. A further feature of` my invention resides in the fact that the actuation `of the pinion ,which meshes with the rack, and also the up and down movements of this pinion, may

be eii'ected from a point near the front of the truck by mechanism which is always accessible and cannot be rendered inaccessible by the proximity of a platfornnto the rear end of the truck.

A lstill further feature is that both the rotative and bodily movements of the pinion are produced by the manipulation of a singie handwlieel which, through manipulation of a clutch shifting lever, is connected to one or the other of a train of mechanisms at' will, both of said mechanisms -being selflockingr so that no independent locking device is required.

Still another feature of my invention is same becomes betterunderstood by reference to the following ldescription when considered in connection with the accompanying drawings.

Referring to the drawings: f

Fig. 1 is a side elevation of a truck elnbodymg my invention,

and advantages ofl my -in-l. vention should be readily apparent as the Fig. 2is a top plan view of the removable body frame structure;

Fig. 3 is an end view looking toward the 'right at Fig. 2;

Fig. 4 is a. side elevation of the .body frame, certain portions being broken away; Fig. 5 is a fragmentary sectional view on the line 5 5 of Fig. 2;

Fig. 6 is a fragmentary plan view of the rear end of the chassis, showing the o-peratingmechanism ig. 7 is a sectional view on the line 7-7 of Fig. 6;

Fig. 8 is a sectional view on the line 8-8 the line 9 9? of Fig. 12 is a sectional view on the line.

12-12 of Fig. 10.

Referring to the drawings more in detail, reference character 15 indicates the side members of the chassis frame, which may be of any preferred construction, the members being customarily. connected at their rear ends by a transverse member 16' and suitably t-ied at their front ends and at intermediate points, if desired. Upon the chassis frame there is rigidly mounted a longitudinally extending track consisting of rails 17 which are preferably of angle shape, the upturned flange 18 forming lateral displacement of the rollers upon which the removable body is supported. At its rear end each of these track rails comprises a flared portion 19, of considerable width at its rear end to accommodatethe rollers of the body and permit .the same to be rolled'onto the chassis'even though it be not accurately aligned therewith. The llared portions ofthe track will receive the rollers and the guard flanges will guide the same so that as the body is movedJ onto thechassis, Y it will become aligned therewith and dis. Tweed 50 squarely upon the 'track rails. a

The. removable truckv body i' comprises a` platform or floor 'and preferably detachable sides made, if desired, insections as indicated by reference characters 21, 22 and 23, all

.'.carried upony the frame structure comprising side members 24 connected by front and'rear cross members 25-and Y26, suitably braced by gusset plates of nother preferred means. Within this frame there forwardand. intermediary axlesf 27 'and 28 against 'displacement axis.

carrying the supporting'rollers 29 disposed between the frame f 'Y W'hile the axles 27 28 are fixed with respect .wth body frame,- the rear axle 31 position but a guard which precludes` are mounted the members' 24 'and held' longitudinally ofthe' projects through bearing openings in the side members 24 so that it is capable of longitudinal sliding movement therein. Upon this axle are rotatably mounted the rollers '32' held vagainst displacement longitudinally of the axle by pins or other 4suitable means, the whole. axle structure, including the rollers, being normally maintained in alignment with the rollers 29, as shown in Fig. 2, by coiled expansion springs 33 disposed between'the rollers'and-an eye 34 formed in the web of the member 35 which will be later described more in detail. These springs yieldingly re tain the axle and rollers thereon in normal if during the loading movements of the body, the rollers should not be exactly in` alignment with the track rails, one'or the other of the rollers 32 would engage the guard flange of the flared portion 'of its track, whereupon, instead of rigidly binding so as to render further movement of the body extremely dillicult, the whole shaft will move endwise'in the frame hence permitting the loading` movement of the body to be continued without noticeable opposition or retardation, and the action of the springs will yieldingly and gradually align the body with the chassis during the continuance ot its movement onto the chassis. These yieldably mounted rollers serve, therefore, Vnot only the function ofrsupporting. the rear end of the body, but also as yieldingly acting aligning instrumentalities which align the. truck body on ,the chassis without cramping or materially interfering with the progress of the body onto the chassis.

Intermediate the side members of the body frame there is disposed a longitudinally extending rack comprising the rear member member has three eyes 37,- 38 and 39 which embrace the intermediate axle 28, and the forward member has a pairof eyes 41, also embracing this axle by which the connected ends of the rack sections are retained in llo position. While the rack might be made in one piece, it-is preferably constructed vas shown, so vthat a standard forward section 361nay be employed onf all installations and the rear section may `be of a length com-mensuratc with the. length of the body. The 's lower face of this rack isequipped throughout its length lwith teeth 42. as will be apparent from Fig. 4, and' its forward end is flared.. as indicated at 43,the teeth extending' |20 ,I

transversely throughout the width of this flared portion, so that the rack will engage with the 'operating pinion at'the beginning -of the loading movement-of the body irreflared portions of thetrack `rails vfacilitate the loading movement of the body onto theV chassis to a considerable degreel and' coni stitute a marked improvement over the straight, narrow rack and track rails heretofore employed.

For the purpose of .enabling the body to be rolled about in the warehouse or on a tom of the rollers 29, and 32, as shown in the drawings, or to be depressed into engagement\with the fioor or platform so as to clear the rollers 29 and 32 from the floor and carry the weight of the body. lVith this end in View, each of the rollers 44 isswiveled upon the bottom of a. channel bar 46 which in operation is pivotedat its inner end at 45v in a bracket 47 carried by the rack. The 'outer end of each channel bar is provided with a strap 48 between which and said bar is disposed a cam 49 carried upon a longitudinally extending rod 51 journaled in bearing brackets 52 projecting inwardly from the frame members 24. The forward end of each rod has ixedly secured thereto a lever arm 53, one projecting upwardl and the other downwardly, these arms eing connected by a link 54. An operating lever 55 securedV to one of the rods 51 at the-for.

ward end of the; body frame may be swung so.as to rock the rods and the cams secured thereon to raise or lower the caster rollers 44 at will. During loading and unloading movements vof the body, the rollers aredisposed in velevated position, as shown in the drawings, but when the body has been removed from the chassis, the lever 55 is rocked to lower the -caster rollers below the plane of the rollers 29 and 32 thereby assuming and entirely carrying the weight of t-he body which may be readily moved about in any desired direction upon these caster rollers.

For ythe purposel of moving the body onto3 and off from the chassis, I have providedoperating mechanism, including a. pinion` i which isadapted to mesh with the teeth 42,

lof the longitudinally extending rack carried by the body, and this.' pinion which is indi- -cated by reference character 56. is shown in Fig. 1 in engagement with the rack, the details of the operating mechanism being best illustrated in Figs. 6, 8 and' 9.

Referring t o these figures. it will be apparent that between sub-frame members 57 extending.longitudinally of the chassis, between the cross members 16 and 58, I have mounted. in suitable bearings 59 and 61 carried by the members 57, a rotatable shaft62 and fixed thereon is a spur gear 6 3 meshing 'with'the pinion 56.- The pinion-56 is journaled upona shaft'64 whichis carried in a yoke 65 fulcrumedupon the shaft 62 and, at a point remote from this shaft, theyOke is provided with a laterally and downwardly projecting boss or bearing portion 66 adapted to overlie and rest upon a heavy multi-leaf spring 67, securely clamped to and carried by an arm 68 of a bell crank lever also fulcrumed upon the shaft 62 at one side of the yoke 65, as will be apparent from Fig. 6. The other arm 69 of the bell'crank lever is provided near its outer end with a channel-shaped guide way 71 from the under side of which a rigid armor extension 72 projects laterally beneath the spring 67,

as shown in Figs. 6 and 8f A roller 73 carriedby a crank arm .74 is engaged in the guide way 71, the crankarm being fixed upon the inner end of a shaft 75 journaled in a suitable bearing "76 and equipped at its other end with a worni gear 77 which meshes With and is adapted to be ydriven by a worm 78 mounted upon a longitudinally extendingshaft 79.

To raise the pinion' 56 into mesh with the rack 35, the worm gear 77 is given a rotary movement bythe worm 78 which is actuated through the shaft 7 9 from a point near the forward end of the chassis, as will be later explained, to thereby swing the crank 74 upwardly carryingwith it the guide way 71. This upward movement of the guide-way rocks the bell crank lever in a counter-clockwise direction, viewing Figs. 8 and 9, there# by lifting the outer or righthand end of the spring 6 7, which, through its engagement with the boss 66, yieldingly elevates the yoke 65 and therebythe pinion 56. The pinion is yieldingly held in this elevated position by the spring 67 so lthat it will mesh with the rack irrespective of limited vertical movements of the rack.

In case the platform onto which the body is .to be rolled from the -truck chais is slightly higher than the rear end ofv the chassis, the rear end of thebody may be ele'- vated to enable movement thereof onto the' platform. This elevation of thebody is effected through the pinionx 56 which -is raised the required distance^by the mechanism just described, carrying the body upwardly with it. Should the body be so heavily loaded .that the Weight thereof cannot be lifted by the spring 57, this spring will Hex until during the upward travel of the guide way 71, the projecting arm 72 engages the lower face of the spring. A direct contact'is then effected between this arm and the boss 66 through the -interposed spring 1 and continued upward movement of the arm will carry the pinion 5'6 upwardly lifting the loaded body to the required height.

Rotation of the pinion 56 to move the body longitudinally of the chassis is effected through rotation of the spur gear 63 fixed on the shaft 62 to the, outer end of which shaft there is secured a.worm wheel 81 meshing 'Y and driven by a, wormSZ mounted upon a forwardly extending shaft When the pinion is meshed with the rack, rotation of the shaft 83 in one direction or the other will move the body longitudinally of the chassis onto or off from the same, as may be desired.

The shafts 79 and 83 of the chassis to a point near the forward end thereof where these shafts are journaled in suitable bearings carried by a casing 84 which is mounted on a casting 85 extending between and riveted or otherwise securely attached to the side members of the chassis frame.

" posed adapted to contain lubricant in which the power transmission mechanism for the shafts 79 and 83 is mounted. This mechanism comprises, a skew gear 86 meshing with and adapted tol be driven by a companion gear 87 loosely mounted upon the transversely extending shaft 88 'which is provided at its outer en d with an operating hand-wheel 89,

will be connected to the shaft 88, and when. *the clutch member is moved to the right, the

gear 92 will be disconnected from the shaft and gear /87 connected thereto, vas will be apparent. For the purpose of shifting the clutch member 95, I have provided a shift lever 96 fulcrumed within the casing at 97 and provided with an'extension 8 to which is secured a leaf spring clutch shl ting member 99' carrying at its free ,end a bifurcated 1 Fig. 10,

may be employed for locking the lever 96 in yoke 101 which engages in the peripheral groove of the clutch member 95. Upon movement of the lever 96 about its fulcrum ina counter-clockwise direction viewing j* A the clutch member. 95 will be moved to t ie right, and if the :clutch .teeth ofthe clutch member and the opposed clutch face are not aligned, the spring member 99 will yield suiiieiently to permit a full-.thrust oflever 96, and when the teeth are subsequently brought into alignment, theywill be snapped into interengaging relation by the resiliency Aof the member 99. Suitable means the two positions to which it may be shifted, and in the present instance, I vhave illustra'ted 'for this purpose a 4spring pressed latch 102 adapted to yieldingly engage a slotted extension 103 formed on the lever 96.

When it is desired to raise or lower the pinion 56, `thefclutch shift lever 96 is swung` extend longitudinallyl The casing 84 provides a closed housing ina counter-clockwise direction viewing Fig. 10 to connect the gear 87 with the shaft 88, whereupon .the handwheel 89 may be turned in t-he desired direction to raise" or lower the pinion through the intermediary of the Atrain of mechanism previously explained.

When loading or unloading movement of the i truck body is desired, the clutch will be shifted to disconnect the gear 87 and connect the gear 92`with the shaft 88. The worm and worm wheel drive between the shaft 79 and the shaft will automatically lock the pinion into the position into which it has been adjusted, this worm and wheel being of the irreversible type, and the handwheel may now be manipulated to rotate the spur gear.

63 thereby-rotating the pinion 56 to impart the desired movements' to the body.

For the purposeof yieldingly breaking the final forward movement of the` vbody onto the chassis, and. for the further purpose ofl holding down the rear end of the body so that it cannot be disengaged from the chassis, but at the same time may be permitted a limited degree of'flexibility, I have mounted at the rear end of the chassis frame and at each side thereof, a hold down hook 104. Each 'of these hooks is mounted upon the outer end of a leaf spring 105 -secured at its inner end by a clamp 106 to the frame member 16, each spring' beingextended through a slot 107 in the rear bracket member 108 and being limited in its upward movement by the member 16 and in its downward' movement by a pin 109 projecting outwardly from this member beneath the spring. The frame side members are eachl providedwitha laterallyextending lug 111 preferably equipped with a roller -which'is `adapted to enter beneath its respective hook 104 as the body approaches the forward limit of its movement. The cam shape of these hooks, in conjunction with springs upon which thel hooks are mounted, provides al braking action which slows down the movement of -the body and brings it gently to rest without objectionable shocksand jars. These-hooks serve also, when the truck'is in transit, to yieldingly hold down the rear end of the body, thereby preventing disengagcment or displacement of the body from. the chassis, but permitting a limited and de- -sirableadegree of flexibility between the body and the chassis.

The forward end of thebody is locked to the chassisvby a pair of hooks 112 fixed tothe chassis near the front end in frame of. the position'to receive the front axle 27 'of Athe b ody frame. l to the chassis at its forwardgend by the hooks 112.and at its rear end by the hooks 104.

` My invention,

operation and many of its inherent advaning wlthout further description, and while The body is, therefore, heldits construction, mode ofl tages ShOlJldv be understood from the forego' 130 I claim:

1. In a removable body truck, the combination/of a chassis frame provided with a track, ay removable body, and laterally yield- .able supporting rollers mounted upon said body in position to engage said track.

2. In a removable body truck, the combination of a chassis frame, a removable body, supporting rollers disposed beneath sald body,` and means for yieldably mounting said rollers so as to permit movement thereof `laterally of the body.

3. In a removable body truck, the combination of a chassis frame, track rails comprising guard anges carried by said frame, a removable body, and a plurality of supporting rollers yieldably mounted on said body so as to be capable of movement laterally with respect tothe body upon engagement with one of said guard flanges.

4. In a removable body truck, the combination of a chassis frame provided with track rails, a removable body, an axle carried thereby, supporting rollers mounted on said axle, land spring means for yieldably maintaining said rollers in normal position, but permitting movement thereof transversely of the body upon engagement with said track rails.

erally ared at their rear ends, and' a removable body provided with laterally selfadjusting rollers and adapted to be supported upon said rails'. A

7. A removable body truck, comprising a chassis frame provided Q withgtrack rails flared at their rear ends, a pinion vmounted on said chassis frame, and a removable body provided with rollers adapted tor travel upon said track rails and with a longitudinally disposed rack adapted to mesh with said pinion, said rack being laterally flared at its forward end. i

8. A `removable body truck, comprising a chassis frame provided with track rails,v af removable body, supporting rollers mounted on said body in position to travel upon said track rails, a rack attached to and extending longitudinally beneath said body, and a pinion on said chassis adapted to mesh with said rack, said track rails beingof increased width at their rear ends-and said rack being of increased width at its forward end to facilitate the travel of .said body onto said chassis.

9. A removable body truck, comprising a chassis frame, a removable body frame, a pinion mounted on the chassis frame, and a longitudinally extending rack mounted on the body frame in position to mesh with said pinion, said rack comprising a plurality of sections disposed in longitudinal alignment Y and flexibly connected together.

10. A removable body truck, comprising a removable body frame, including longitudinally extending side members, axles extending transversely between said side members, supporting rollers mounted on said axles, and a rack extending between said side members, said rack including front and rear sections provided with interengaging 1- eyes embracing one of said axles.

11. In a removable body truck, the combination of a chassis frame including side and end members, track rails supported onsaid frame a body movable on said rails, bracket ymembers supporting the .rear ends of said rails, leaf springs secured at their inner endsto the rear end member of the frame and projecting laterally ofthe frame through `said bracketv members, and a cam-shaped hold down hook mounted upon the outer end of each spring in position to retain the removable body on said chassis.

\12. A removable body truck, comprising a chassis, a removable body ada ted to be supported thereby, a plurality o caster rollers mounted on and beneath said body, and means for simultaneously lowering and raising said rollers with respect to said body in tlclz operative and inoperative positions at w1 j 13. A removable body truck, comprising a chassis, a body removably mounted thereon, 'swiveled supporting rollers' adjustably mounted on said body and adaptedV` to be lowered to support the weight of the bodyv or to be raised into inoperative'l position, and

means for simultaneously lowering a plurality of said rollers( 14. In a removable body truck, the combination of a. chassis frame, a pinion adjustably mounted thereon, a removable body, va rack carried thereby and adapted to mesh with said inion, means for rotating said pinion, and) means for adjusting said pinion, said last mentioned means including a spring adapted to exert `a limited upward thrust to said pinion and a member cooperative lwith said springto move said pinion and springbeyond the effective action lof.-

said spring.

15. In a removable body truck, the combination of a 'chassis frame, a removable body provided with a rack, a. pinion adjustl beyond the ably mounted on said chassis frame in position to engage and actuate said rack, means including a worm drive for rotating said pinion, and means for verticall adjusting said pinion, said means inclu ing a bell crank lever, a'spring carried thereby in position to exert an upward thrust upon the spring for positively lifting said pinion after t e maximum thrust of said spring has been exerted thereon, whereby relatively to the chassis.

j 17. In a removable body truck, the combination of a chassis frame, a shaft'extending transversely thereof, a worm wheel'and 'a spur gear fixed on said shaft, a worm for actuating said shaft, a yoke pivoted on said shaft a pinion carried by said yoke and to 11a said body meshing with said spur gear, a rackadapted to which said rack is secured,

sis whereby said pinion loperating member mounted near the wardend of the chassis, 'and means whereby yto mesh with said gear," a removable body lever, a spring carried by one arm thereof and adapted to engage the yoke, a uide way formed in the other arm of said ell crank lever, a crank pin engaged in said guide way, a Worm and worm wheel for actuating said crank pin to an armrigidly carried lever in position to en said spring has been mined degree. 18. In a removable body truck, the combination of a chassis, a pinion adjustably mounted thereon. a removable body provided with a rackA adapted to mesh with said pinion, means including a shaft extending longitudinally of Athe chassis whereby said pinion may be adjusted, means including a shaft extending'longitudinally of the chasmay be rotated, an

exed to a vpredetersaid member may be operatively connected with either of said shafts at will.

19. In a removable body truck, the combination of a chassis frame, a pinion ad ably mounted thereon,

pinion, means for adjusting and rotating said pinion, including'an adjusting-"shaft and a rotating shaft extending lon itudinally 'of the chassis, a transverse sha near. the forward end of the chassis, an' -op- 1 with said pinion, means a bell crank rock said bell crank lever, and

by said bell crank` age said yoke when,

p justa.VIN a removable bodyha` rack on said body adapted to'. meshl with said mounted erating wlieel'fixed on said shaft, and means for connecting and disconnecting said transverse shaft at will with said-operating and rotating shafts. l

20. In a removable body truck, the combination of a chassis, a pinion adjustablycarried thereby, a removable body, a rack on said body adapted to mesh with said pinion, means for rotating and adjusting said pinion, comprising rotating and. adjusting shafts extending longitudinally of the chassis, a handwheel mounted near the forward end ofthe chassis, and operative connections between said handwheel and said shafts including a shiftable clutch whereby either of said shafts may be connected tosaid Wheel at will. 4

21. 1n a removable body truck, the combination vof a chassis, a pinion adjustablyand rotatably mounted thereon, a removable body, a rack on said body adapted to mesh for adjusting and rotating said pinion, comprising a pair of shafts lextending longitudinally of the chasi I sis,` a gear caseA mounted on said chassis near the forward end thereof into which saidv shafts project, a transverse'shaft projecting into said gear case, and 'driving connections vbetween said transverse shaft and said longitudinally extending shafts including a gear fixed to each of said longitudinally extendl ing shafts, apair of gears loosely .mounted on said transverseishaft and meshingwith said first mentioned gears, and a clutch member splined to said ltransverse shaft and adapted to engage'g in alternation the gears on said shaft, manually operable means for shifting said clutch member, and means for rotating said transverse shaft.

22. In a removable body truck, in combination, a chassis, a a body, laterally movable supporting rollers for said body, and means to return said rollers to normal position. i

23. In a'removable body truck, a chassis'.

said elevating means to elevate said bodyV under abnormal loads.

24. In a removable. truck, a chassis,a pin-` .a'body re ion ad'us'tably carried thereby,

mova-'b y disposed on said'chassiaa rack connect'ed to said body and adapted to be driven by said pinion, means to resiliently urge said ody loads, and means to positively raise said bodywhen carryinga--load greater than. the tensile strength of said resiliently urging track on said. chassis,

Ypinion, rack and bodyupward under normal il'o" frame', a removable body positioned on said: frame, cooperative means on saidy frame and iis' means to move said lever about its connected to said .body and arranged to be operatively engaged by saidepinion, a pivoted lever, a leaf spring secured at one end to said pivoted lever and arranged to resilientlyengage said pinion adjustment and pivot to adjust said pinion. f

26. In a removable body truck, a chassis, a pinion carried thereby, a body removably disposed on said chassis, a rack connected to said body and arranged to be operatively engaged by said pinion, and means to adjust said pinion upwardly including, a pivoted lever, a leaf spring having one endl connected to said lever and having its other end arranged to adjustsaid pinion upwardly under ,normal loads, and means to reenforce said spring under abnormal loads.

27. The sub-combination comprising a van member adapted to be optionally mounted upon a platform, swiveled' caster wheels mounted on the bottom of said van body, said wheels being normally adapted to act as followers and to thereby becomeautomati-l cally aligned during the travel of the van along a surface by frictional contact of said wheels therewith. and supplemental rollers adapted to receive the direct Weight of said van when the said wheels are displaced in a vertical planesulliciently to raise the said wheels out of contact with an underlying platform.

28. In a removable body truck, a chassis frame, a pinion carried by said frame, a body removably disposed upon said chassis, a rack carried by said body, means including a resilient element cooperative with said rack for resiliently elevating said body, and means to positively position said elevating means.

y WILLIAM M. BAXTER. 

